Carburetor device



Sept- 28; 1948- F. A. KOMMER ETAL 2,450,049

cARBuREToR DEVICE Filed 1mg.v 22, 1945 INVEN'roRs FRED A. KOMMER ROBERT W. BOEHLOW Patented Sept. 28, 1948 CARBURETOR DEVICE Fred A. Kommer and Robert W. Boehlow, St.

Louis, Mo., assignors to Carter Carburetor Corporation, St. Louis, Mo., a corporation of Dela- Ware Application August 22, 1945, serial No. 612,040 I s claims. (cl. r4-470) This invention relates to mechanical movements for transmitting motion between a rotating shaft and a linearly reciprocating member off -set laterally therefrom.

The invention is especially adapted for yieldingly operating a carburetor accelerating pump from the usual manual throttle valve. Ordinarily, the plunger of a carburetor accelerating pump operates vertically or at a right angle to the throttle shaft and, accordingly, may be rather easily and conveniently connected to the throttle shaft by means of links and levers properly positioned. However, where the pump plunger moves in a different direction relative to the throttle shaft, for instance, horizontally, the problem of transmitting motion thereto from the rotating throttle shaft is more difficult, especially, where the pump is to be yieldingly operated. Moreover, it is desirable that equal angular movements of the throttle shaft produce equal linear movements of the pump plunger and also that the action of the yielding means in the pump operating connection be as uniform as possible.

Accordingly, it is an object of thepresent invention to provide novel means for operatively connecting a rotating throttle shaft to a pump plunger or like member which operates linearly in a plane other than perpendicular t the throttle shaft. f

Another object is to provide novel means for connecting a carburetor accelerating pump with the throttle so as to insure equal movements of the pump plunger for equal movements of the throttle shaft.

Another object is to provide means to yieldlngly connect a carburetor accelerating pump with the throttle shaft incorporating a. spring element arranged to function uniformly throughout the throttle and pump movements.

These objects and other more detailed objects hereafter appearing are attained by the device illustrated in the accompanying drawing in which Fig. 1 is a side view and vertical section of an automotive carburetor embodying the invention.

Fig. 2 is an elevation of a part of the carburetor taken at 90 to Fig. l.

Fig. 3 is a fragmentary view of a portion of the structure in Fig. 2 and showing parts in different positions.

The carburetor in Fig. 1 includes a downdraft mixture conduit 5 having a series of venturis 6 and flanged at its lower end, as at 1, for attachment to the engine intake manifold (not shown). The entry of air to the upper end of the conduit is controlled by a butterfly choke valve 8 and the discharge of mixture is controlled by a throttle valve 9 mounted on a shaft I0 journalled in the walls of the conduit. An operating arm II is rigidly secured to one end of throttle shaft Ill. At one side of the conduit there is provided a constant level'bowl I2 from which fuel is supplied to the main nozzle I3 through main metering orifice element I4 controlled by metering rod I5. Idling fuel is supplied through idling restriction I6 and passage I1 to a port I8 in the wall of the mixture conduit adjacent the edge of the throttle when closed.

A cap 20 attached to a boss 2I on one side of the mixture conduit secures in position accelerating pump diaphragm 22 having an actuating stem or plunger 23 centrally secured thereto. The diaphragm is constantly urged toward the left or charging direction by a coiled spring 24. During leftward movement of the diaphragm, a charge of fuel is drawn into pressure chamber 25 past inlet check 26. Upon movement of the diaphragm in the opposite direction, fuel is discharged past outlet check 26 and through restricted nozzle 21 into the mixture conduit.

Rigidly attached to the end of throttle shaft I0 opposite lever II is a second lever 30 and loosely received on the shaft just inside of lever 30 is a sheave wheel 3|, A lever 32 is pivoted to an extension 33 on pump cover 20 and has one arm provided with' an adjustable contact 35 for operatively engaging the protruding end of pump actuating plunger 23. A coiled, tension spring 38 forms a yieldable cord secured at` one end 31 veccentrically to the throttle shaft by means of lever 30 and at the other end to the arm of lever 32 opposite element 35. Intermediately, spring cord 36 extends partially around the peripheral surface of sheav^ wheel 3 I.

In operation, opening of the throttle valve is accompanied by the clockwise rotation of lever 30 (Figs. l, 2, and 3) which applies tension to spring cord 36, so as to rotate lever 32 clockwise and actuate plunger 23 in the pump discharging direction. Because of the interposltion of loose sheave wheel 3l, equal increments of angular movement of the throttle valve produce equal increments of linear movement of the pump plunger. Furthermore, spring cord 36 is caused to stretch uniformly along its length, as indicated in Fig. 3. If guide wheel 3l were stationary or even rigid with throttle shaft I0, the spring cord would tend to stick to the surface thereof and the operation would be erratic. Loose sheave wheelv 3| eliminates such erratic spring action and provides a desirable uniform pump operation.

The invention may be modified in various respects as will occur to those skilled in the art and the exclusive use of all modifications as come within the scope of the appended claims is contemplated.

We claim:

1. Means for transmitting motion between a rotating'shaft and a reciprocating member comprising a. sheave wheel loosely mounted on said shaft, a flexible element eccentrically secured at one end to said shaft and extending -along the peripheral surface of said wheel, and an operative connection between the other end of said flexible element and said reciprocating member.

2. Means for Atransmitting motion between a rotating shaft and a reciprocating member comprising a sheave wheel loosely mounted on said shaft, a lever rigid with said shaft. a flexible element secured at one end to said lever and extending along the peripheral surface of said wheel, and a lever pivoted adjacent said reciprocating member and having an arm disposed to operate said member, the other end of said flexible element being operatively connected to said lever.

3. Means for transmitting motion between a rotating shaft and a reciprocating member cornprising a sheave wheel loosely mounted on said shaft, a linearly yieldable, flexible element eccentrically secured at one end to said shaft and extending along the peripheral surface of said wheel, and an operative connection between the other end of said flexible element and said reciprocating member.

4. Means for transmitting motion between a rotating shaft and a reciprocating member comprising a sheave wheel freely mounted co-axially relative to said shaft, a coiled tension spring eccentrically secured at one end to said shaft and extending partially around the peripheral surface of said wheel, and a lever pivoted adjacent said reciprocating member and having one arm disposed to operate the same, the other end of said tension spring being operatively connected' to said lever.

5. Means for transmitting motion between a rotating shaft and a reciprocating plunger spaced laterally therefrom comprising a sheave wheel loosely received about said shaft, a lever rigid with said shaft immediately adjacent said wheel. a second lever pivoted adjacent said reciprocating member and having lan arm in alignment therewith for operating the same, and a spring cord secured at one end to said first lever and at the other to said second lever, and intermediately extending partially around the peripheral surface of said sheave wheel.

FRED A. KOMMER. ROBERT W. BOEHLOW.

REFERENCES CITED The following references are of record in the 

